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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: 1/9.3^4.3^n=3^7 !!!!!!!!!!!!!!!!!!!!!!!!!

Toán Lớp 6: 1/9.3^4.3^n=3^7
!!!!!!!!!!!!!!!!!!!!!!!!!

Comments ( 2 )

  1. Giải đáp:

     

    Lời giải và giải thích chi tiết:

     1:9×3^4×3^n=3^7

    1:9x81x3^n=2187

    1:9×3^n=2187:81

    1:9×3^n=27

    3^n=27:9:1

    3^n=3

    3^n=3^1

    =)n=1

    Vậy n=1.

  2. $#Dream$

    1/9.3^4.3^n=3^7

    9.3^n=3^7

    3^2.3^n=3^7

    3^n=3^7:3^2

    3^n=3^5

    =>n=5

    Vậy n=5

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222-9+11+12:2*14+14 = ? ( )